Pasting mechanism for bag closing and sealing machines



July 13, 1954- H. v. KINDSETH ET AL PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10, 1951 6 Sheets-Sheet l 3nnentors m I jfgm/d rmez jVm .J. za /mar (lttor'negs J y 1954 H. v. KINDSETH ET AL 2,683,435

PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10, 1951 e Sheets-Sheet 2 3nnentor8 @aid 7 [Fa/2% Z. fiZpX ZYZZJ Ottomegd y 1954 H. v. KINDSETH ET AL 2,683,435

PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10, 1951 6 Sheets-Sheet 3 My -3nventors 8g fia/z/P ZHZfgv/FM Gttornegs y 1954 H. v. KINDSETH ET AL PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10, 1951 6 Sheets-Sheet 4 M F M w July 13, 1954 H. v. KINDSETH ETAL 8 3 PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10 1951 I 6 Sheets sheet 5 I I ZZZ *Q 49 56 5/" 5 5;-

5/5 JA z /49 u r 9 1&95gfl? a, -50 'i% .5. 5X 64 m E 6 f4 103 Enigm H. v. KINDSETH ETAL 2,683,435

July 13, 1954 PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Filed March 10', 1951 6 Sheets- Sheet 6 (Ittomegs Patented July 13, 1954 PASTING MECHANISM FOR BAG CLOSING AND SEALING MACHINES Harold V. Kindseth and Frank L. Hopkins, Minneapolis, Minn., assignors to Bemis Bro. Bag 00., Minneapolis, Minn., a corporation of Missouri Application March 10, 1951, Serial No. 214,940

6 Claims.

Our invention relates generally to bag closing and sealing machines and more particularly to improvements in mechanism for applying paste to filled bags during the closing of the bags and prior to the final closing and sealing thereof.

More specifically, our invention relates to improved pasting mechanism for use in connection with machines of the type disclosed in the United States Letters Patent No. 1,868,686, granted to Daniel Belcher, July 26, 1932.

An important object of our invention is the provision of novel means whereby a quantity of paste fed from a paste reservoir or the like for the sealing of filled bags may be quickly and easily varied to a fine degree.

Another object of our invention is the provision of novel paste pan or reservoir construction for machines of the above type, wherein a paste feed roller provides an end wall for the paste reservoir.

Another object of our invention is the provision of a doctor blade and novel means for mounting the doctor blade on a paste pan as set forth and of means for adjustably moving the doctor blade toward and away from the paste feed roller to vary thickness of the paste film on said feed roller.

Another object of our invention is the provision of a machine having a paste reservoir, a paste feed roller cooperating therewith, dauber means for transferring paste from the feed roller to the bags to be sealed, and novel means for mounting the reservoir for movements thereof and the feed roller toward and away from the paste dauber means, whereby to prevent building up of paste on the dauber means when the machine is in operation, but when no filled bags are being fed therethrough.

Another object of our invention is the provision of means, in machines of the type set forth, for mounting the paste reservoir whereby the same is permitted to be easily removed for cleaning, servicing, or the like.

Another object of our invention is the provision of paste-applying mechanism, as set forth, which is relatively simple and inexpensive to manufacture and install, which is highly efficient in operation, and which is rugged in construction and durable in use.

The above and still further highly importan objects and advantages of our invention will become apparent from the following detailed specification, appended claims, and attached drawings.

Referring to the drawings, which illustrate the invention, and in which like characters indicat like parts throughout the several views;

Fig. 5 is an enlarged fragmentary section taken on the line 5-5 of Fig. 3;

Fig. 6 is a fragmentary detail as seen from the line 65 of Fig. 4;

Fig. 7 is a transverse sectional detail taken substantially on the line l-'! of Fig. 3;

Fig. 8 is a view in plan of a filled bag partially closed and pasted in accordance with our invention;

Fig. 9 is a fragmentary view partly in side elevation and partly in section taken substantially on the line 99 of Fig. 3;

Fig. 10 is an enlarged fragmentary detail in plan, as seen from the line |BI9 of Fig. l; and

Fig. 11 is a wiring diagram.

In the drawings, a frame structure is indicated by the numeral I and has rigidly secured to its upper end portion, by means of machine screws or the like 2, a pair of laterally spaced side frame members 3 and 4. Bag holding mechanism comprises a rotary member 5, mounted fast on a shaft 6 journalled in the frame structure I, and compartment-forming bag supporting elements 7 and 8. The shaft 6 is rotated by suitable transmission mechanism driven by a motor, not shown, through connections including an endless drive belt or the like 9. Filled bags A are fed successively to the bag holding means by transverse and longitudinal pusher elements H3 and IE1 respectively, see Figs. 1 and 10. The pusher elements receive the filled bags A from an endless conveyor belt II which is suitably mounted for conveying movements on spaced pulleys [2, one of which is shown, and which are journalled in the frame I. A discharge conveyor I 3is located in the lower part of the frame I and is adapted to receive bags A discharged from the bag holding means and to transport the bags to a suitable receiving point remote from the bag holding means. The conveyor 13 runs over spaced rollers l4 and [6, the former of which underlies the bag holding mechanism. Guide rails is and I1 aid in supporting the bags in upright and inverted positions, respectively, when the bags A are being delivered to the bag holding means and transported therefrom.

Bag folding fingers l8 operated by mechanism, not shown but contained within a head it, and relatively stationary folding blades 28 and 25 are utilized to perform closing operations on the sealed bags A. Prior to the initial folding of the bags A by the folding fingers It, a primary coating of glue or paste is applied to a portion of each thereof by pasting means, not shown, and the is maintained in a partially folded condition, by a pressure plate 22 mounted on bracket means 23 and in a fully folded condition by a pressure plate E l mounted on a bracket 25 after a subsequent quantity of paste is applied to partially folded portions of the bag as will hereinafter appear. The bracket means 23 and bracket are rigidly mounted on the frame structure l. Movement of a bag A through the machine causes the bag to be delivered to the discharge conveyor it in inverted condition and the bags are lowered from the bag holding means to the conveyor i3 by a lowering device 25 pivotally secured to the bracket and yieldingly biased in the direction of the bag holding means by a coil spring 2? secured at its opposite ends to the lowering mem-- ber 28 and the bracket 25. The elements of the folding and sealing machine above described and the operation thereof are fully disclosed in detail in the Belcher patent above identified and the copending applications of Harold V. Kindseth, for United States Letters Patent, Serial No. 195,4 7, filed November 1.3, 1950, now Patent Number 2,624,369, and entitled "Pasting Mechani m for Bag Closing and Sealing Machines, and Serial No. 198,683, filed December 1, 1950, now Z atent Number 2,599,393, and entitled Bag Supporting Means for Bag Closing and Sealing Machines. The above described mechanism does not in i self constitute the instant invention,

for the sake of brevity, it is thought unnecessary to describe the same in greater detail.

The method employed herein of closing and sealing a filled bag A is fully disclosed in the Belcher patent, above identified. The initial pasting operation and the initial folding operation, performed by the folding fingers 13, result in a bag top formation, illustrated in Fig. 8, and provide opposed laterally extended flaps A. The A are provided with glued or pasted areas after which said flaps are turned over upon one another and the closed tops of the bag A by the folding blades 28 and 21. Paste to be applied to the flaps A is fed from a paste reservoir 29 by a feed roll r 35 and paste daubers 3i Each paste dauber comprises a shoe 32 connected to a rotary shaft 33 by means of a bracket s4 and mounting studs 35. A pair of springs 36 are interposed between the opposite ends of the shoe 32-2 and the bracket B l and bias the daubing shoe 32 in a direction radially outwardly of the shaft 33. rigid link Bl provides positive driving connection between the bracket 34 and the shoe 32 whereby rotary movement is positively imparted to the shoe 32 upon rotation of the shaft 33. As shown, the daubing shoes 32 are preferably triangular in shape so as to deposit a layer of paste of substantially the same shape as each tab 28 but of smaller size than said tabs.

paste reservoir or pan 29 is generally rectangular in form and includes a bottom wall 36, opposed side walls as, and one end wall so, the other end of the reservoir 29 being open. A pair of supporting arms ill extend longitudinally of the frame i and are secured one to each side of the paste reservoir 29 by machine screws or the like $2. The feed roller 3B is iournalled for rotation on a shaft 43 that extends through aligned bearing bosses id and 35 one each integrally formed with each of the supporting arms fl It will be noted, with reference particularly to l, that the side walls 39 of the reservoir at its open end are arcuate in form, the arcuate ends having a radius substantially equal to that of the feed roller 30. The feed roller 3% is so disposed with respect to the reservoir 28 that the arcuate ends of the side walls have frictional sealing engagement with peripheral wall portions of the feed roller 30 adjacent its opposite ends. It will also be noted, by reference to Fig. that the feed roller 36 is spaced from the bottom wall 38 of the reservoir 39 in a manner to provide therebetween a discharge opening The mounting arms ll at one end are provided with aligned openings ll outwardly of the end wall so of the reservoir and through which extends a trunnion forming rod or shaft 68. The shaft 48 has its opposite ends receivable within upwardly opening notches 4% in a pair of supporting brackets 49 one each rigidly secured to an opposite frame member 3 and t by means of bolts or the like 5. At their opposite ends, the arms Al are provided With longitudinally outwardly opening recesses 52 which are defined by relatively long upper fingers 52c and relatively short lower fingers lite and which are adapted to receive the outer ends 52 of crank-acting arms 53 and 53, the former of which is pinned or otherwise rigidly secured to a transversely extending shaft 54 journalled in the opposite side frame elements 3 and it, and the latter of which is journalled on said shaft 5 3-. An adjustment arm 55 is rigidly secured at one end, by welding or the like, to the crank-acting arm 5;". At its other end, the arm 55 is provided with an enlarged head 56 having therein a slot til (see Fig. 9) through which extends a nut'equipped clamping screw 58. Said screw 58 also extends through a suitable aperture in the intermediate portion of a relatively long crank arm 59 secured at one end to the shaft 54 by a set screw 60. At its other end, the crank arm 59 is pivotally connected to one end of a rigid adjustable link i i, the other end of which is pivotally secured to the outer end of a relatively short crank arm 62.

i The inner end of the crank arm 52 is keyed or iii) otherwise rigidly secured to the inner end of a relatively short shaft 53 journalled bearing boss integrally formed with the side frame member 3. The shaft 63 extends outwardly through the side frame member 3, and into the interior of a housing 3 mounted on the outer side of a frame member 3, see Figs. 1, 3, and 9. Another crank arm 35 is rigidly secured to the outer end of the shaft 63 interior of the housing 3 and is connected at its free end to the depen ing portion of a solenoid armature, th solenoid being indicated in its entirety by the numeral 66, the armature being indicated at 57, and the Winding of the solenoid being indicated at 68.

A leaf spring 69 is rigidly secured at one end to the bearing boss E l. The free end portion of the spring t9 engages an abutment in the nature of a stud or screw 7!] that rojects laterally outwardly of the crank arm 62 intermediate its and urges the crank arm 62 in a direction to move said crank arms 55 and 53, the shaft and the crank-acting arms 53 in directions to bring the reservoir 29 and the feed roller 3t into their normal operating positions of Fig. 4. The purpose of the solenoid 66 and the movable parts associated therewith, together with the operation thereof, will hereinafter appear. It will be noted that shifting the arm 55 with respect to the crank arm 59 will cause the crank-acting arm 53' to rotate with respect to its opposite crank-acting arm 53. By this means, the reservoir 29 and feed roller 30 may be leveled so that the clearance between both dauber shoes and the feed roller will be equal.

In order that paste may be delivered from the reservoir 29 to the flaps on the bags A, rotary feeding movements must be imparted to the feed roller 30 and to the shaft 33. To accomplish this end, cooperating gears H and I2 are mounted fast on the dauber shaft 33 and feed roller shaft 43, respectively. The gear 1| may be assumed to be power driven from the motor, not shown, by suitable connections, also not shown but fully disclosed in the Belcher patent above identified. Inasmuch as the dauber shaft 33 is journalled in the side frame elements 3 and 4, and the feed roller shaft 43 is journalled in the arms 4|, adjustment of the length of the adjustable link 6| will effect the amount of clearance between the feed roller 39 and the dauber shoes 32. By lengthening or shortening the link 6|, this clearance may be accurately adjusted to meet varying conditions of operation.

The feed roller 30 is adapted to rotate in one direction only, namely counterclockwise, with respect to Figs. 2 and 4. Means for preventing rotation thereof in the opposite direction comprises a single tooth ratchet 13 rigidly secured to the feed roller shaft 43 by means of a set screw or the like 14, and a cooperating pawl 15 mounted for pivotal movements on a radial wall 30 of the feed roller 30 by means of a machine screw or the like 16. A leaf spring 1'! is riveted or otherwise secured at one end to the pawl 15 and has its free end bearing against a stop pin or the like 18 projecting axially outwardly from the partition 30 whereby to yieldingly bias the pawl 15 in a direction to engage the ratchet 13.

The discharge passage 46 extends in a direction parallel to the axis of the feed roller 30 for substantially the entire width of the reservoir 29 and rotation of the feed roller 30 causes a thin film of paste to be carried thereby through the discharge opening 46 to the exterior of the reservoir 29 whereupon a portion thereof will be deposited upon the dauber shoes 32 which will in turn transfer the paste to the flaps A of the bags A, as the bags are carried therepast by the bag holding means. The paste in the reservoir is liquid in form and is identified in Fig. 4 by X.

We provide means for varying the thickness of the film of paste carried by the feed roller 30 or, if desired, for cutting off said film altogether when the machine is to be-shut down or for any other reason. The above-mentioned means comprises a doctor blade or the like 19 mounted on the undersurface 80 of the reservoir bottom wall 38. The doctor blade 19 is. held against the undersurface 89 by a plurality of levers 8| that are pivotally mounted intermediate their ends on a common shaft 82 carried by lugs 83 depending from the reservoir bottom wall 38. The inner ends 84 of the levers 82 engage the doctor blade 19 at longitudinally spaced points thereon and urge the doctor blade into contact with the undersurface 88 responsiveto yielding bias exerted on the opposite ends-85 of the lever arm 8| by a plurality of coil compression springs 86 interposed therebetween and the bottom wall 38 of the reservoir 29. At its opposite ends, the doctor blade 19 is provided with apertures 81, one of which is shown, through which extend nutacting elements 88 having threaded engagement with the threaded ends 89 of a pair of adjusting screws 90 one each of which is disposed adjacent opposite sides of the reservoir 29. The adjusting screws 90 are journalled in lugs 9| integrally formed with and depending from the arms 4! and are maintained against axial movements with respect in one direction by stop collars 92 and in the other direction by knurled adjustment knobs 93. As shown in Figs. 2 and 4, the knobs 93 engage one side of the lugs 9| whereas the stop collars engage the opposite sides thereof. Manipulation of the knobs 93 will cause the adjustment screws 90 to move the doctor blade 19 across the discharge opening 46 toward or away from engagement with the feed roller 30. From the above, it should be obvious that by this means, the thickness of the film of paste X carried by the feed roller 30 to the dauber shoes 32 can be varied to a relatively fine degree or, if desired, the doctor blade 19, in contacting the feed roller 30, will shut oif the supply of paste X from the reservoir altogether.

The arrangement above disclosed for mounting and supporting the reservoir 29 and the feed roller 30 permits ready removal thereof for cleaning or servicing. When it is desired to remove the reservoir 29 and feed roller 38, the rear end 40 of the reservoir 29 together with the rear ends of the arms 4| secured thereto and the shaft 58 are manually raised until the end portions of the shaft 48 are removed from the notches 49a in the brackets 49. The reservoir 29, arms 4| and the shaft 48 are then moved rearwardly until the opposite end portions of the shaft 48 engage the shoulders 49' on the brackets 49. With the reservoir moved to this position, the upper fingers 51a of the arms 4| rest upon the ends 52 of the crank arms 53 and 53', whereas the lower fingers 5|b thereof are moved laterally outwardly with respect to said ends 52, thus permitting the reservoir and feed roller together with the arms 4| and shaft 48 to be lifted out of the machine. The bias of the coil springs 86 causes the doctor blade 19 to be pressed sufiiciently firmly against the undersurface of the reservoir bottom 33 so that leakage of paste between the doctor blade and the undersurface 80 does not occur.

In the event that the feeding of bags A to the machine is interrupted, control means for the solenoid 66, now to be described, will be actuated to cause the solenoid 66 to raise the feed roller 3|] and the adjacent end of the reservoir 29 out of operative engagement with the daubers 32, whereby to prevent an excessive amount of paste from accumulating on the daubers 32. An electrical circuit for the solenoid 66 includes a lead 94 which may be assumed to extend from a source of electrical power such as the opposite sides of a power line, not shown. Interposed in the lead 94 is the winding 68 of the solenoid 66, a feeler switch 95, and a two-position cam-operated limit switch 96. A shunt circuit for the feeler switch includes a lead 91 extending from the lead 94 between the solenoid winding 66 and the feeler switch 95 to the other side of the limit switch 96, a holding switch 98 being interposed therein. It will be noted that the lead 94 extends through the limit switch 96 when the switch arm 99 thereof is positioned to engage a contact I98, whereas the shunt lead 91 terminates in, a contact |8| 7 engaged by the switch arm 99 in the other position of the limit switch 95. The limit switch 96 is provided with a cam follower roller I02 that is positioned to be engaged by a limit switch oper ating cam I03 mounted fast on the power driven rotary dauber shaft 33.

The feeler switch 95 is of the normally closed type located adjacent the path of travel of filled bags into the bag-supporting mechanism and is provided with a bag engaging feeler I04 which is p-ivotally mounted, as indicated at I05, see Figs. and 11, in a manner to be moved by filled bags entering the bag-supporting mechanism. It will be noted that the feeler I94 is elongated in the direction of travel of the filled bags toward the bag-supporting mechanism for a purpose which will become apparent. It should be further noted that the holding switch 98 is of the normally open type and is closed by energization of the solenoid 69.

With the bag closing and sealing machine running and with no bags being fed therethrough, the solenoid 66 is energized by completion of a circuit through the lead 94 when the limit switch arm 99 engages the switch contact I03 responsive to rotary movement of the cam 383 to bring the follower roller I02 into registration with the relatively low cam surface I05 thereon. Energization of the solenoid 60 causes the holding switch 98 to be closed, thereby closing a holding circuit through the solenoid winding 08, a portion of the lead 94, the shunt lead 3?, and the contact IIJI and the switch arm- 99 when the cam follower roller I02 engages the relatively high cam surface I01. When the hold switch 98 is closed by the movement of the lever arm 65, there is sufficient overtravel in the switch 98 in a switch closed direction so that during the relatively short time interval required for the travel of the limit switch arm 99 from its engagement with the contact I09 until it engages the contact IOI, the solenoid armature 5? will not be permitted to drop sufficiently to open the holding switch 93. This arrangement permits substantially constant energization of the solenoid 66 whereby to maintain the feed roller out of engagement with the dauber shoes 32.

When a filled bag is moved by the longitudinal bag pusher It toward the bag supporting mechanism, the bag A will engage the feeler I04 and move the same laterally to open the feeler switch 95-, the length of the feeler I04 permitting switch opening contact thereof by the bag for a sufiicient length of time to permit rotation of the limit switch cam I03 to a point where the cam follower I02 moves to the low portion I09 of the cam. The circuit through the solenoid winding :59 is then broken through the shunt lead 9? at the limit switch S8 and through the lead 9 at the feeler switch 95 thereby de-energizing the solenoid E6. De-energization of the solenoid permits bias of the leaf spring 69 to aid downward movement of the gravity biased crank arms, paste reservoir, and feed roller 36 toward engagement of the feed roller with the dauber shoes 32. Continued rotation of the shaft 33 and the limit switch cam I03 causes the cam follower I02 to rise into engagement with the cam surface I07 during which time the filled bag A has been carried out of engagement with the ieeler H34. At this stage of the cycle of operation, the solenoid 66 will not be re-energized by reason of the fact that the holding switch 98 has been opened and will stay open until rotation of the cam I03 causes the limit switch arm 99 to engage the limit switch contact I05. Of course, as soon as this engagement is made, the solenoid 66 will be again energized to cause movement of the said roller 30 away from the dauber shoes 32. Obviously, if the filled bags are fed to the bag-supporting means in an un interrupted series, the feeler switch will be maintained in an open condition and the solenoid 66 will remain de-energized until the series is interrupted.

Our invention has been thoroughly tested and found to be completely satisfactory for the accomplishment of the objectives set forth; and, while we have shown and described a preferred embodiment of our novel mechanism, it will be understood that the same is capable of modifica tion without departure from the spirit and scope of the invention as defined in the claims.

What we claim is:

1. Paste applying mechanism of the type utilized in bag closing and sealing machines having means for holding filled bags and means for closing the open tops of said bags, said mechanism comprising a paste reservoir having opposed side walls, a bottom wall and an delivery end, a pair of supporting arms one each mounted on an opposite side wall of said res voir in parallel relation, a feed roller extend across the open end of said reservoir and providing an end wall therefor, said feed roller being iournalled in the adjacent ends of said support-- ing arms for rotary movements in one direction to cause a film or paste to be carried thereby to the exterior of said reservoir, means for transferring at least a portion of said paste film from the feed roller to the bags to be sealed, feed roller and the bottom wall of said reservoir being spaced apart to define a paste discharge opening elongated in a direction parallel to the axis of the feed roller, a doctor blade having nut-acting elements at its opposite end portions, means on said reservoir mounting said doctor blade on the undersurface of the reservoir for movements toward and away from the i'eed roller across the discharge opening, said doctor blade mounting means including spring means nrg said blade toward engagement with said u Ur surface, and adjustable means carried by arms for moving said blade toward and away from the feed roller whereby to vary the thickness of said paste film.

2. The structure defined in claim 1 in which said adjustable means comprises a pair of manually operated adjustment screws having threaded engagement with the nut-acting elements on said doctor blade.

3. Paste applying mechanism of the type utilized in bag closing and sealing machines having means for holding filled bags and means for closing the open tops of said bags, said mechanism comprising a paste reservoir having opposed side walls, a bottom wall and an open delivery end, a feed roller extending across the open end of said reservoir and providing an end wall therefor, the side walls at the open end of the reservoir having arcuate end portions which make frictional sealing engagement with the peripheral end wall forming surface of the feed roller adjacent its opposite ends, means mount ing said feed roller for rotary movements in one direction to cause a film of paste to be carried thereby to the exterior of the reservoir, means for transferring at least a portion of said paste film from the feed roller to the bags to be sealed, said feed roller and the bottom wall or" the hopper being spaced apart to define a paste-discharge opening elongated in a direction parallel to the axis of the feed roller, a doctor blade, means mounting said doctor blade on the undersurface of said reservoir for movements toward and away from the feed roller across the discharge opening, said doctor blade mounting means including a plurality of springs urging said blade into contact with said undersurface, and a pair of adjustment screws one each disposed adjacent an opposite side of the reservoir and each operatively associated with one end portion of the doctor blade whereby said doctor blade may be moved toward or away from the feed roller to vary the thickness of the paste film.

4. Pasting mechanism for a bag closing and sealing machine having a frame structure including a pair of laterally spaced upright frame members, and means on said frame structure for supporting filled bags to be sealed; said pasting mechanism comprising a paste reservoir having opposed side walls, a bottom wall and an open delivery end, a pair of supporting arms one each mounted on an opposite side wall of said reservoir, a feed roller extending across the open end of said reservoir and providing an end wall therefor, said feed roller being journalled in the adjacent ends of said supporting arms for rotary movements in one direction to carry a thin film of paste to the exterior of the reservoir, means for transferring paste from the feed roller to the bags to be sealed, said last-mentioned means including a rotary member and connections therebetween and said feed roller causing rotation of one thereof in a direction opposite to that of the other thereof, said feed roller and the bottom of the reservoir being spaced apart to define a paste discharge aperture elongated in a direction parallel to the axis of the feed roller, a doctor blade,

means mounting said doctor blade on the undersurface of the reservoir for movements toward and away from the feed roller across the discharge opening, the doctor blade mounting means including a plurality of coil springs urging said blade into contact with said undersurface, and a pair of adjustment screws one each disposed adjacent an opposite side of the reservoir and each operatively associated with an end portion of the doctor blade whereby said doctor blade may be moved toward or away from the feed roller tovary the thickness of the film, and means for mounting said reservoir between said frame members, said last-mentioned means including the arms on said reservoir and. mechanism for moving the reservoir and feed roller toward and away from said paste-transferring means.

5. In a bag closing and sealing machine, a frame structure, means on said frame for supporting bags to be closed and sealed, means for successively feeding filled bags to the bag-supporting means, mechanism for applying paste to the bags, said mechanism comprising a paste reservoir and a feed roller associated therewith and rotatable in a direction to carry a film of paste to the exterior of the reservoir, means for transferring at least a portion of the paste film from the feed roller to the bags to be sealed, means mounting said reservoir and feed roller in said frame structure for movements toward and away from said paste transferring means, and mechanism responsive to movements of the filled bags toward the bag-supporting means for moving said reservoir and feed roller into engagement of said feed roller with said paste transferring means, said last-mentioned mechanism comprising a solenoid, a power circuit for said solenoid, linkage operatively associated with said solenoid and said reservoir and feed roller and movable by said solenoid in directions to cause movement of said reservoir and feed roller in one direction with respect to said paste film transferring means, and a power circuit for said solenoid; said power circuit including switch means engageable by successive bags moved toward said bag-supporting means to cause movement of the solenoid operated linkage in one direction.

6. Pasting mechanism for a bag closing and sealing machine having a frame structure, and means in said frame structure for supporting a filled bag; said pasting mechanism comprising a paste reservoir having opposed side walls, a bottom wall and an open delivery end, a feed roller mounted for rotary movement in one direction at the open end of said reservoir and providing an end wall therefore, rotation of the feed roller causing a film of paste to be carried to the exterior of the reservoir, means for transferring at least a portion of said paste film from the feed roller to the bags to be sealed, means mounting the reservoir to said frame for movement of the feed roller equipped end thereof toward and away from operative engagement of said feed roller with said paste transferring means, said reservoir mounting means including a rock shaft and a cooperating rock arm supporting the roller equipped end of said reservoir and pivot means at the other end whereby said reservoir and feed roller may be removed from said frame structure, said feed roller and the adjacent end of said bottom wall defining a paste discharge opening elongated in a direction parallel to the axis of the feed roller, a doctor blade mounted to the under surface of the reservoir for movements toward and away from the feed roller across said discharge opening, and means for moving said doctor blade with respect to the feed roller independently of the movement of said feed roller and reservoir with respect to said paste film transferring means, whereby to vary the thickness of said paste film.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 694,749 Hobbs Mar. 4, 1902 1,280,288 Perkins Oct. 1, 1918 1,536,511 McLaren May 5, 1925 1,616,724 Weber Feb. 8, 1927 1,822,466 Valdes Sept. 8, 1931 1,868,686 Belcher July 26, 1932 

